--Mr. Li, I found a watch on the playground.You should try to find out A. whose is the

--Mr. Li, I found a watch on the playground.
--You should try to find out
A. whose is the watch
B. who is the owner of the watch
C. whom does the watch belong to

解析：此题重点考查宾语从句的语序问题。在宾语从句中，不论哪种句式充当宾语从句都要用陈述句语序。选项A和C都是疑问句语序，故被排除，只能选B。

这个问题的回答的对